Scaling behavior of the surface energy in face-centered cubic metals

Jo, Min Ho; Choi, Young Won; Koo, Yang Mo; Kwon, S. K.

doi:10.1016/j.commatsci.2014.05.042

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…It is observed that the atoms of Ag NPs exhibit a spatial distribution of three-layer structures with three kinds of atomic physical states: inner layer, SPA-FCC; middle layer, SPA-AS; outer layer, LPA. At the initial stage of surface melting at 1110.2 K, as shown in figures 8(a1) and (a2), this three-layer structure is so irregular that there is no clear interface between both the middle layer and outer layer, which indicates that a unstable liquid-like shell is formed on the surface of Ag NPs, and that the surface morphology of the solid core with SPA-FCC is bumpy owing to the diversity of facets with various surface energies [75]. When the temperature reached 1120.0 K (b1, b2), the interface between both the middle layer and outer layer becomes clear and the surface of the solid core with SPA-FCC becomes smoother than before (a1).…”

Section: Melting Behaviors Of Larger Ag Npsmentioning

confidence: 99%

Size-dependent melting modes and behaviors of Ag nanoparticles: a molecular dynamics study

Liang

Zhou

et al. 2017

Nanotechnology

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The size-dependent melting behaviors and mechanisms of Ag nanoparticles (NPs) with diameters of 3.5-16 nm were investigated by molecular dynamics (MD). Two distinct melting modes, non-premelting and premelting with transition ranges of about 7-8 nm, for Ag NPs were demonstrated via the evolution of distribution and transition of atomic physical states during annealing. The small Ag NPs (3.5-7 nm) melt abruptly without a stable liquid shell before the melting point, which is characterized as non-premelting. A solid-solid crystal transformation is conducted through the migration of adatoms on the surface of Ag NPs with diameters of 3.5-6 nm before the initial melting, which is mainly responsible for slightly increasing the melting point of Ag NPs. On the other hand, surface premelting of Ag NPs with diameters of 8-16 nm propagates from the outer shell to the inner core with initial anisotropy and late isotropy as the temperature increases, and the close-packed facets {111} melt by a side-consumed way which is responsible for facets {111} melting in advance relative to the crystallographic plane {111}. Once a stable liquid shell is formed, its size-independent minimum thickness is obtained, and a three-layer structure of atomic physical states is set up. Lastly, the theory of point defect-pair (vacancy-interstitial) severing as the mechanism of formation and movement of the solid-liquid interface was also confirmed. Our study provides a basic understanding and theoretical guidance for the research, production and application of Ag NPs.

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Section: Melting Behaviors Of Larger Ag Npsmentioning

confidence: 99%

Size-dependent melting modes and behaviors of Ag nanoparticles: a molecular dynamics study

Liang

Zhou

et al. 2017

Nanotechnology

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“…Similar to figure 4, these vacancy ordering layers mainly locate around grain boundary [32], and they are just parallel to the grain boundary (orange dashed lines). In fact, the {111} lattice plane possesses the lowest surface energy in f-phase [33,34], which corresponds to the {0001} lattice plane in h-phase. With the decrease of the thickness of GST film from 500 to 20 nm, similar to the device miniaturization, the [0001] texture phenomenon was observed in ultrathin film [35].…”

Section: Resultsmentioning

confidence: 99%

Effect of vacancy ordering on the grain growth of Ge₂Sb₂Te₅ film

Liu¹,

Tang²,

Zheng³

et al. 2023

Nanotechnology

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Ge2Sb2Te5 (GST) is the most widely used matrix material in phase change random access memory (PCRAM). In practical PCRAM device, the formed large hexagonal phase in GST material is not preferred, especially when the size of storage architecture is continually scaling down. In this report, with the aid of spherical-aberration corrected transmission electron microscopy (Cs-TEM), the grain growth behavior during the in situ heating process in GST alloy is investigated. Generally, the metastable face-centered-cubic (f-) grain tends to grow up with increasing temperature. However, a part of f-phase nanograins with {111} surface plane doesn’t grow very obviously. Thus, the grain size distribution at high temperature shows a large average grain size as well as a large standard deviation. When the vacancy ordering layers forms at the grain boundary area in the nanograins, which is parallel to {111} surface plane, it could stabilize and refine these f-phase grains. By elaborating the relationship between the grain growth and the vacancy ordering process in GST, this work offers a new perspective for the grain refinement in GST-based PCRAM devices.

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“…There are two main types of texture in FCC metal: (i) the plane-strain texture, including the brass ({011}<211>), copper ({112}<111>), and S ({123} <634>) textures, and (ii) the recrystallization texture, including cube ({001}<100>) and goss ({110}<001>) [ 26 , 27 , 28 , 29 , 30 , 31 ]. Al alloy corrosion usually involves precipitates, constituent particles [ 4 , 32 , 33 ], and texture [ 34 , 35 , 36 ]. Refs.…”

Section: Introductionmentioning

confidence: 99%

Texture-Induced Corrosion Resistance of Dissimilar AA7204/AA6082 Friction Stir Welded Joints

Guan,

Yuan,

Zhang

et al. 2023

Materials

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The quasi in situ EBSD test was applied to study the effect of grain orientation on corrosion behaviors of the thermomechanically affected zone I (TMAZ I) of dissimilar AA6082/AA7204 friction stir welding (FSW) joints in this work. The results show that the structure with grain orientation close to the brass texture ({110}<112>) has excellent corrosion resistance, which contributes to the better corrosion performance of the TMAZ I of the 7204-AS joint than the 7204-RS joint. Furthermore, the brass texture around by S texture ({213}<364>) in the TMAZ I of the 7204-AS joint is slightly corroded, and the orientation of the remaining structure is closer to the ({110}<112>) than before, which indicates that the corrosion, like deformation, is carried out alongside the {110} plane for the structure with grain orientation near {110}<112>. Those findings could provide new insight into the designed FSW joints and improve the corrosion resistance of the wrought aluminum alloy.

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Scaling behavior of the surface energy in face-centered cubic metals

Cited by 8 publications

References 20 publications

Size-dependent melting modes and behaviors of Ag nanoparticles: a molecular dynamics study

Size-dependent melting modes and behaviors of Ag nanoparticles: a molecular dynamics study

Effect of vacancy ordering on the grain growth of Ge₂Sb₂Te₅ film

Texture-Induced Corrosion Resistance of Dissimilar AA7204/AA6082 Friction Stir Welded Joints

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Scaling behavior of the surface energy in face-centered cubic metals

Cited by 8 publications

References 20 publications

Size-dependent melting modes and behaviors of Ag nanoparticles: a molecular dynamics study

Size-dependent melting modes and behaviors of Ag nanoparticles: a molecular dynamics study

Effect of vacancy ordering on the grain growth of Ge2Sb2Te5 film

Texture-Induced Corrosion Resistance of Dissimilar AA7204/AA6082 Friction Stir Welded Joints

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Effect of vacancy ordering on the grain growth of Ge₂Sb₂Te₅ film